Definition of "tensing" [tensing]

• Present participle of tense. (verb)

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• "When I got behind the wheel of Coche I turned to look at Dad, who was already tensing up his leg muscles as I prepared to slide the front seat forward."
• "“Rosario agreed to spend the week with me,” he said, his voice tensing."
• "My entire body orgasmed, my legs and muscles tensing and clenching with pleasure, my breath exploding in a shudder."